Hakkila, Pentti Developing technology for large - scale production of forest chips : wood energy technology programme 1999-2003 : final report / Pentti Hakkila. -- Helsinki : TEKES, 2004. -- 99 s. : far. obr., tab., graf. ; 25 cm. -- (Technology Programme Report ; 6/2004). -- ISBN 952-457-151-X (brož.) : 5,5. -- ISSN 1239-1336

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